25621534 has 4 divisors (see below), whose sum is σ = 38432304. Its totient is φ = 12810766.

The previous prime is 25621513. The next prime is 25621543. The reversal of 25621534 is 43512652.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6405382 + ... + 6405385.

It is an arithmetic number, because the mean of its divisors is an integer number (9608076).

Almost surely, 2^25621534 is an apocalyptic number.

25621534 is a deficient number, since it is larger than the sum of its proper divisors (12810770).

25621534 is a wasteful number, since it uses less digits than its factorization.

25621534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12810769.

The product of its digits is 7200, while the sum is 28.

The square root of 25621534 is about 5061.7718241738. The cubic root of 25621534 is about 294.8051341628.

It can be divided in two parts, 2562 and 1534, that added together give a 12-th power (4096 = 2¹²).

The spelling of 25621534 in words is "twenty-five million, six hundred twenty-one thousand, five hundred thirty-four".